Figure 12-5 The Performance tab of Task Manager shows real-time processor and memory usage. in Visual Basic .NET

Encoder PDF 417 in Visual Basic .NET Figure 12-5 The Performance tab of Task Manager shows real-time processor and memory usage.

Figure 12-5 The Performance tab of Task Manager shows real-time processor and memory usage.
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If the sustained processor usage exceeds 80 percent, the processor is probably a performance bottleneck on the computer. If the page file usage value runs near 100 percent continuously, you might need to increase the size of the page file or add more memory to the computer.
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In addition to displaying these four graphs, the Performance tab also displays the fol lowing sections:
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Totals Provides totals for the number of processes, threads, and handles that are currently running. A process is a single executable program. A thread is an object within a process that runs program instructions. A handle represents a specific input/output (I/O) instance. A process may have multiple threads, each of which in turn may have multiple handles.
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Monitoring Windows XP Perfromance
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Physical Memory (K) Indicates the total and available physical memory, and the amount of memory in the system cache. Commit Charge (K) ning processes. Indicates the memory that is currently committed to run
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Kernel Memory (K) Indicates the memory that is used by the operating system. Paged kernel memory is available only to system processes. Nonpaged kernel memory can be used by applications when necessary.
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Monitoring Network Activity
The Networking tab in Task Manager, shown in Figure 12-6, indicates the current network traffic on various network connections on the computer. You can use this infor mation to quickly determine if the network is causing a bottleneck that would result in performance problems for applications that require network connectivity. The detailed information at the bottom of the tab displays current network utilization and link speed for each enabled adapter.
Figure 12-6 The Networking tab of Task Manager shows current network activity.
Monitoring Performance by Using the Performance Tool
When troubleshooting performance issues, you may need more detail than Task Man ager provides. If so, you can use the Performance tool to collect vast amounts of per formance information. In addition to providing access to more detailed information, the Performance tool allows you to monitor other systems remotely, log information for future analysis, and configure alerts to notify you of potential error conditions. The Performance tool classifies information in the following areas:
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Monitoring System Performance in Windows XP
Object An object represents a major system component (hardware or software) of the computer or operating system. Examples of objects include physical disks, processor, and memory. Instance Each occurrence of an object is considered an instance. For example, if there are two processors on a computer, there are two processor instances. If there are three hard disks on a computer, each disk is represented by a separate instance. Counter A counter is a particular aspect of an object that the Performance tool can measure. For example, the physical disk object contains the following counters:
Percentage Disk Read Time Average Disk Bytes Per Read Disk Reads Per Second
To start the Performance tool, follow these steps: 1. From the Start menu, select Control Panel. 2. In Control Panel, select Performance And Maintenance. 3. In the Performance And Maintenance window, select Administrative Tools. 4. In the Administrative Tools window, select Performance. When you first start the Performance tool, the graph displays three counters by default (as shown in Figure 12-7):
Pages/sec Represents the rate at which pages are read from or written to disk during virtual memory operations. Consistently high values can indicate that not enough memory is present on a system. Avg. Disk Queue Length Represents the average number of read and write requests queued for the selected disk. Consistent values above zero mean that requests are backing up, which may indicate inadequate memory or a slow disk system. %Processor Time Represents the percentage of elapsed time that the processor spends executing nonidle tasks. Consistently high values (over approximately 80 percent) might indicate that your processor is slowing down your system.
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Monitoring Windows XP Perfromance
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Figure 12-7 The Performance Tool starts working right away.
The three default counters actually do a very good job of representing the basic aspects of a computer s performance. Of course, they are only three of the hundreds of counters that are available in the Performance tool. The counters that you monitor depend on whether you are trying to collect general baseline information, troubleshoot a performance problem, diagnose an issue with an application, and so on. Detailed information on commonly monitored objects and counters is presented later in this section. To add a counter to the Performance tool, follow these steps: 1. Right-click the graph and select Add Counters. 2. In the Add Counters dialog box, shown in Figure 12-8, select the computer that you want to monitor.
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